Accession Number : ADA261256


Title :   Alternating Current (AC) Impedance Testing of Coated Traycans


Descriptive Note : Final rept. Jul 1991-Jan 1993


Corporate Author : CORTEST COLUMBUS TECHNOLOGIES OH


Personal Author(s) : Lawson, Kurt ; Beavers, John


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261256.pdf


Report Date : Jan 1993


Pagination or Media Count : 33


Abstract : This is the final report on Cortext Columbus Technologies' program entitled 'AC Impedance Testing of Coated Trycans', performed under Contract DAAK60-90-1301. The overall objective of the program was to evaluate the relative resistance of several candidate coatings prior to retorting to a solution containing NaCl and citric acid (simulating saline, acidic food product) at ambient temperature. An additional objective of the program was to perform an initial assessment of the applicability of the AC impedance technique as a quality assurance technique for traycan coatings. The performance of the coatings was evaluated by means of an Electrochemical Impedance Spectroscopy (EIS) technique, also referred to as AC impedance. The EIS technique was found to be a sensitive technique for measuring coating degradation on the traycans. Of the coatings analyzed, the VMC coating, in general was found to be the best performer, followed closely by DMS and VMS. The control coating was found to be the poorest coating, of the coatings analyzed.


Descriptors :   *ALTERNATING CURRENT , *COATINGS , *IMPEDANCE , ALUMINUM COATINGS , CARBOXYLIC ACIDS , CITRIC ACID , CORROSION RESISTANCE , DEGRADATION , ELECTROCHEMISTRY , EPOXY COATINGS , PLATING , QUALITY ASSURANCE , SODIUM CHLORIDE , SPECTROSCOPY , STEEL , TEMPERATURE , TEST AND EVALUATION , TIN , VINYL RADICALS


Subject Categories : Physical Chemistry
      Coatings, Colorants and Finishes
      Properties of Metals and Alloys
      Electricity and Magnetism


Distribution Statement : APPROVED FOR PUBLIC RELEASE